{"id":3039018,"url":"https://alion.io/job/xflow-senior-java-engineer","title":"Senior Java Engineer","company":{"id":4431640,"name":"Xflow","domain":"xflow.com","url":"https://alion.io/company/xflow-com","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"BambooHR","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":58000,"max_usd":96000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":352},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Java","optional":false},{"name":"MVC","optional":false},{"name":"SQL","optional":false},{"name":"Apache Camel","optional":true},{"name":"AWS","optional":true},{"name":"GCP","optional":true},{"name":"Google BigQuery","optional":true},{"name":"Gradle","optional":true},{"name":"GraphDB","optional":true},{"name":"Kubernetes","optional":true},{"name":"Neo4j","optional":true},{"name":"RabbitMQ","optional":true}],"status":"live","first_seen_at":"2026-06-29T00:00:00Z","employer_posted_date":"2026-06-29","last_verified_at":"2026-10-28T18:14:22Z","board_verified":true,"closed_at":null,"days_open":121,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":121},"description":"X-FLOWis a mobile game development company established in 2018. We gained recognition after the release ofHappy Color, the most popular digital coloring book and one of the most successful ad-driven mobile apps in the world.\nWe're looking for a Senior Java Engineerto join our team and help us build an analytical system that processes petabytes of data.\nWe expect candidates to have a deep understanding of the tools they use. If you can assess the complex problem, design and deliver a solution with attention to balance between performance and complexity - we might be looking for you.\nTechnology stack:\nGradle, Java 21+, Spring, k8s, RabbitMQ, Service-oriented infrastructure, AWS and GCP cloud platforms.\nRequirements:\nStrong understanding of Java Core, Memory Model, MultiThreading.\nStrong understanding of Spring Core, Data, MVC.\nProficiency in SQL, solid understanding of Relational Databases.\nSolid understanding of software development principles.\nSolid understanding of data storage design principles.\nNice to have:\nExperience writing and optimizing BigQuery queries.\nExperience with Spring Reactive stack, Spring Batch and AMPQ.\nExperience with Apache Camel.\nExperience with Graph DB like Neo4j.\nResponsibilities:\nYou'll be involved across the full lifecycle of tasks - from solution design through implementation, debugging, and documentation.\nWhat We Offer:\nCompetitive salary and benefits package.\nOpportunity to work with a talented and passionate team in a creative and dynamic environment.\nFlexible working hours and remote/office work options.\nCareer growth and professional development opportunities.\nA fun and inclusive company culture that celebrates diversity and creativity.\nJoin us and let’s create great content together!\nWhen you apply for this role, we process your personal data in accordance with our Candidate Privacy Notice( https://xflowgames.com/candidate-privacy-notice).","description_format":"text","description_chars":1906,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Flexible schedule","Professional development"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-21T22:14:01Z"}],"visa":[],"liveness":{"score":8,"band":"cold","label":"Long shot","p_open":1,"p_active":0.296,"p_room":0.28,"age_days":121,"expected_fill_days":28,"reasons":["conf:1","win:tail","crowd:"],"computed_at":"2026-10-28T05:59:10Z"},"pay":null,"html_url":"https://alion.io/job/xflow-senior-java-engineer","json_url":"https://alion.io/job/xflow-senior-java-engineer.json","meta":{"generated_at":"2026-10-28T18:28:39Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":25249,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-29T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":4431640},"rest":"https://alion.io/mcp/rest/get_company?id=4431640"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fxflow-senior-java-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fxflow-senior-java-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fxflow-senior-java-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/xflow-senior-java-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fxflow-senior-java-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3039018}},{"tool":"search_jobs","arguments":{"company":"xflow.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3039018},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); 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